code: def testRegression(self):
      inputv = readVector(join(testdir, "input_pow2.txt"))
      expected = readVector(join(testdir, "output.txt"))
  
      output = AutoCorrelation()(inputv)
  
      self.assertAlmostEqualVector(expected, output, 1e-4)
  
file_path: essentia/test/src/unittests/stats/test_autocorrelation.py
imports: from essentia_test import *
label_desc: Use image node_id 1 for calling the TestAutoCorrelation obj's underlying member method code with example usage: obj.testRegression() without return types